KR102474299B1 - Method for fabricating digital denture and apparatus thereof - Google Patents

Abstract

A digital denture design method and device are disclosed. According to the digital denture design method and device, it is possible to create an arch suitable for the patient primarily using impression body data and impression model data, and ideal Arch lines can be created.

Description

Digital denture design method and apparatus {Method for fabricating digital denture and apparatus thereof}

The present invention relates to image data processing and simulation technology using software, and more particularly to tray manufacturing and data transfer technology using software.

When manufacturing a digital denture using software, a method of manufacturing a model after obtaining an impression and scanning it or a method of scanning the impression as it is can be used. In general, after importing model scan data using wax rim, when the user directly selects a reference point in consideration of the anatomical structure, the software connects them with a line and arranges the teeth according to the connected line. do.

According to an embodiment, a digital denture design method and apparatus capable of automatically generating an ideal arch line suitable for a patient when manufacturing a digital denture and arranging the denture along the arch line are proposed.

A digital denture design method according to an embodiment includes obtaining impression model data of a patient, and analyzing the obtained impression model data based on learning data (the learning data generated by performing artificial intelligence-based learning) and extracting a region in which a landmark is expected, and detecting a point having the largest curvature in the extracted landmark expected region as a landmark for generating an arch line.

A digital denture design method according to an embodiment includes generating an arch shape using impression model data of a patient, detecting a landmark for creating an arch line from the impression model data, and the generated arch shape Generating an arch line by passing the detected landmark within a preset range, and arranging the denture along the created arch line.

The step of generating the arch shape includes acquiring impression body data of the patient, acquiring corresponding impression model data from the obtained impression model data, and connecting the most protruding parts of the acquired impression model data. It may include creating an arch shape.

In the step of detecting the landmark, the landmark may be detected using machine learning-based artificial intelligence. The step of detecting the landmark may include: recognizing objects from impression model data through object recognition; extracting a region where a landmark is expected using pre-learned data among the recognized objects; A step of setting a point having the greatest curvature within the landmark expected region as a landmark.

In the step of detecting the landmark, the 1-1 point for determining the position of the maxillary central incisor, the 2-1 point for determining the position of the maxillary canine, and the 3-1 point for determining the position of the maxillary rear posterior teeth can be detected as a landmark. The 1-1 point may be a Central Ridge Point (CRP), the 2-1 point may be bilateral Canine prominence (CPR, CPL), and the 3-1 point may be bilateral maxillary tuberosity (MTR, MTL) and bilateral canine prominence (CPR, CPL). It may be at least one of Hamular Notch (HNR, HNL).

In the step of detecting the landmark, the 1-2 point for determining the position of the lower central incisor and the 3-2 point for determining the position of the rearmost posterior tooth of the lower jaw may be detected as landmarks. The 1-2 point may be a Central Ridge Point (CRP), and the 3-2 point may be both Retromolar Pad Mesials (RPMR, RPML).

In the step of detecting the landmark, the 2-2 point for determining the position of the lower canine may be additionally detected as a landmark, and the 2-2 point may be both canine prominence (CPR, CPL).

In the step of arranging the dentures, the posterior part of the maxilla so that the Fossa of each posterior tooth is located within a predetermined range based on the alveolar line from both sides of the maxilla Canine prominence (CPR, CPL) to Maxillary Tuberosity (MTR, MTL) on both sides of the maxilla can be arranged

The digital denture design method may further include detecting, as a landmark, an Incisive Papilla for arranging teeth of the upper jaw as a landmark. Central incisors can be arranged so that they are positioned.

In the step of arranging the dentures, in the case of the lower jaw, the rearmost posterior teeth are arranged so that they do not exceed both Retromolar Pad Mesial (RPMR, RPML), and both Retromolar Pad Mesial (RPMR) in both canine prominence (CPR, CPL) , RPML), the posterior teeth of the lower jaw can be arranged so that the Fossa of each posterior tooth is located within a predetermined range based on the alveolar line.

The digital denture design method may further include the step of detecting both retromolar pad linguals (RPMR, RPML) for the arrangement of the teeth of the lower jaw as landmarks, and in the step of arranging the dentures, the lingual cusps of each posterior tooth are The posterior teeth of the mandible can be arranged so as not to exceed the Pound's Line connecting the retromolar pad lingual (RPMR, RPML) and the canine prominence (CPR, CPL) on both sides.

The digital denture design method may further include a step of detecting, as landmarks, points of retromolar pads 2/3 on both sides for arranging the teeth of the lower jaw. The posterior molar can be arranged so that it does not rise higher than the 2/3 point of the retromolar pad in the adjustment.

In the step of arranging the dentures, the teeth of the lower jaw may be arranged in proportion to the size of the teeth of the upper jaw, or the teeth of the upper jaw may be arranged in proportion to the size of the teeth of the lower jaw.

The digital denture design method may further include modifying the created arch line by user manipulation.

In the modifying step, the arch line may be corrected and displayed by an operation of selecting and moving a point where the user wants to modify in the generated arch line.

The digital denture design method includes the step of guiding the user's arch line correction by displaying the expected line of the buccal-lingual side of the lower jaw on the upper jaw or on the lower jaw using the occlusion relationship between the upper jaw and the lower jaw. can include more.

The digital denture design method may further include automatically correcting an arch line of the opposite jaw when correcting any one of the upper and lower arch lines.

A digital denture design device according to another embodiment generates an arch shape using a data acquisition unit that acquires impression model data of a patient and the impression model data obtained through the data acquisition unit, and an arch line is formed from the impression model data. A control unit for detecting a landmark for generation and arranging a denture along the created arch line after generating an arch line such that the generated arch shape passes within a preset range based on the detected landmark; and an output unit that outputs information including tooth arrangement.

In the past, the user had to manually draw an ideal arch line, or the user manually drew the reference line necessary for denture arrangement, and then manufactured the denture, which caused a lot of inconvenience in use. However, according to the digital denture design method and device according to an embodiment, the process of creating an arch line and the process of arranging a denture can be automatically performed using software, thereby greatly improving the convenience of use.

Furthermore, it is possible to primarily create an arch suitable for a patient using impression body data and impression model data, and an ideal arch line can be created using a landmark that is a reference point for creating an arch line. At this time, work efficiency can be increased by minimizing landmarks for creating an ideal arch line.

According to the digital denture design method and device according to an embodiment, by detecting landmarks using artificial intelligence, an ideal arch line can be created, and its accuracy can be further increased as learning progresses.

1 is a diagram showing the configuration of a digital denture design device according to an embodiment of the present invention;
2 is a diagram showing the flow of a digital denture design method according to an embodiment of the present invention;
3 is a diagram illustrating a process of creating a maxillary arch line for denture arrangement according to an embodiment of the present invention;
4 is a diagram illustrating a process of creating a lower arch line for denture arrangement according to an embodiment of the present invention;
5 is a view showing an example of generating an arch shape from impression model data of the upper jaw according to an embodiment of the present invention;
6 is a view showing an example of generating an arch line by detecting landmarks for creating an arch line of the upper jaw and connecting the detected landmarks for creating an arch line according to an embodiment of the present invention;
7 is a diagram showing additionally detectable landmarks in the upper jaw according to an embodiment of the present invention;
8 is a view showing an example of generating an arch shape from impression model data of the lower jaw according to an embodiment of the present invention;
9 is a view showing an example of detecting a landmark for creating an arch line of the lower jaw according to an embodiment of the present invention;
10 is a diagram showing additionally detectable landmarks in the lower jaw according to an embodiment of the present invention;
11 is a diagram illustrating a flow for correcting an arch line according to an embodiment of the present invention;
12 is a diagram illustrating an example of a method for correcting an arch line according to an embodiment of the present invention.

Advantages and features of the present invention, and methods for achieving them, will become clear with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only the present embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs It is provided to fully inform the holder of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numbers designate like elements throughout the specification.

In describing the embodiments of the present invention, if it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted, and the terms described later will be used in the embodiments of the present invention. These terms are defined in consideration of the functions of and may vary depending on the user's or operator's intention or custom. Therefore, the definition should be made based on the contents throughout this specification.

Combinations of each block of the accompanying block diagram and each step of the flowchart may be executed by computer program instructions (execution engine), and these computer program instructions are executed by a processor of a general-purpose computer, special-purpose computer, or other programmable data processing device. Since it can be mounted, the instructions executed through the processor of a computer or other programmable data processing device create means for performing the functions described in each block of the block diagram or each step of the flowchart.

These computer program instructions may also be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing device to implement functionality in a particular way, such that the computer usable or computer readable memory The instructions stored in are also capable of producing an article of manufacture containing instruction means for performing the functions described in each block of the block diagram or each step of the flow chart.

And since the computer program instructions can also be loaded on a computer or other programmable data processing device, a series of operational steps are performed on the computer or other programmable data processing device to create a computer-executed process to create a computer or other programmable data processing device. It is also possible that the instructions for performing the data processing apparatus provide steps for executing the functions described in each block of the block diagram and each step of the flowchart.

In addition, each block or each step may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical functions, and in some alternative embodiments may refer to blocks or steps. It should be noted that it is also possible for functions to occur out of order. For example, two blocks or steps shown in succession may in fact be performed substantially concurrently, or the blocks or steps may be performed in the reverse order of their corresponding functions, if necessary.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the embodiments of the present invention exemplified below may be modified in many different forms, and the scope of the present invention is not limited to the embodiments described below. The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art.

1 is a diagram showing the configuration of a digital denture design device according to an embodiment of the present invention.

Referring to FIG. 1, a digital denture design device 1 according to an embodiment acquires clinical data of a patient to perform orthodontics, prosthetics, dentures, etc. in an actual dentistry, and uses the clinical data through software control. Through diagnosis and analysis, simulation is performed to establish a treatment plan. The present invention relates to a technique for generating an arch line suitable for a patient and arranging teeth along the arch line when manufacturing a denture. In particular, it can be applied when manufacturing a complete denture.

The digital denture design device 1 is an electronic device that executes an image processing program. Electronic devices include computers, notebook computers, laptop computers, tablet PCs, smart phones, mobile phones, personal media players (PMPs), personal digital assistants (PDAs), and the like.

Referring to FIG. 1 , a digital denture design device 1 according to an embodiment includes a data acquisition unit 10, a storage unit 12, a control unit 14, an input unit 16, and an output unit 18. .

The data acquisition unit 10 acquires dental image data from teeth including damaged teeth of the patient. Dental image data includes, for example, patient CT data and oral cavity scan data.

The intraoral scan data is data having information of actual teeth including damaged teeth, and may be 3D information. Oral scan data may be obtained by scanning a plaster model created by imitating the patient's oral cavity with a 3D scanner. As another example, it may be obtained by scanning the inside of the oral cavity of the patient using a 3D intra-oral scanner. The obtained oral scan data may be stored in the storage unit 12 . The intraoral scan data may include impression body data and impression model data.

CT data may be obtained by generating tomographic images of the patient's head using computed tomography (CT), segmenting a boundary of a tooth in each tomographic image, and then combining them into one. These oral scan data and CT data include images obtained by imaging the upper edentulous jaw with the patient's mouth open, images obtained by imaging the lower edentulous jaw with the patient's mouth open, images obtained by imaging local areas in the centric position, oral radiographs, etc. includes The obtained CT data may be stored in the storage unit 12 .

The storage unit 12 stores various data such as information necessary for the operation of the digital denture design device 1 and information generated according to the operation. In the storage unit 12 according to an embodiment, oral scan data and CT data of an individual patient are stored, and oral scan data and CT data of a specific patient among the entire oral scan data and CT data are stored in the oral cavity scan data and CT data according to a user's request. 14) can be provided. At this time, the storage unit 12 stores images of the upper jaw and lower jaw of each patient, and provides the upper and lower jaw images matched to the oral scan data and CT data of a specific patient to the control unit 14 according to a user's request. can

The control unit 14 controls each functional unit while establishing a plan for treatment through control by a computer program. The control unit 14 manages the screen information displayed on the screen through the output unit 18, and establishes a treatment plan by performing simulation through diagnosis and analysis using dental images through control by software. Dental images refer to multi-dimensional images such as 2-dimensional and 3-dimensional images of a patient generated for establishing a treatment plan. Various types of images, such as X-ray, CT, MRI, panoramic images, intraoral scan images, images generated through reconstruction, and images obtained by matching multiple images, can be used in the treatment plan.

The controller 14 according to an embodiment may create an arch shape using impression body data and impression model data, and may automatically create an arch line necessary for denture arrangement using a landmark. For example, an arch shape is created using impression model data obtained through the data acquisition unit 10, and a landmark for arch line generation is detected from the impression model data. Subsequently, an arch line is created so that the created arch shape passes within a preset range based on the detected landmark, and then the dentures are arranged on the impression model data along the created arch line.

In the above-described method, after first creating an arch suitable for the patient using impression body data and impression model data, an ideal arch line is created using a landmark that is a reference point for creating an arch line. to be.

The input unit 16 receives a user manipulation signal through a user interface. For example, the input unit 16 receives a user manipulation signal such as a mouse click from a dental image displayed as a virtual graphic object on a screen through the output unit 18 .

The output unit 18 displays landmarks, arch lines, tooth arrangements, and the like on a dental image, and displays a simulation process through the control unit 14 on the screen. Furthermore, the tooth arrangement designed through the control unit 14 may be output through a 3D printer.

2 is a diagram illustrating the flow of a digital denture design method according to an embodiment of the present invention.

Referring to FIG. 2 , the software generates an arch shape using impression data of the patient (S210). Impression data acquisition methods include scanning the patient's oral cavity using an intraoral scanner, obtaining an impression of the patient by injecting impression material into a ready-made tray, and then scanning the impression as it is, and injecting impression material into a ready-made tray to obtain an impression of the patient. There is a method of manufacturing an impression model after obtaining an impression of and then scanning the impression model. The present invention may use a method of obtaining 3D impression model data (both shapes) corresponding to the shape of the acquired impression body data (negative shapes) after acquiring impression body data (negative shapes). In this case, an arch shape connecting the most protruding parts of the 3D impression model data may be created.

Subsequently, the software detects landmarks for arch line generation from the impression model data (S220). The landmark for creating the maxillary arch line may include at least one of Central Ridge Point (CRP), Canine prominence Right (CPR), Canine prominence Left (CPL), Maxillary Tuberosity Right (MTR), and Maxillary Tuberosity Left (MTL). have. The landmark for creating the arch line of the lower jaw may include at least one of a Central Ridge Point (CRP), a Retromolar Pad Mesial Right (RPMR), and a Retromolar Pad Mesial Left (RPML). Additionally, Canine prominence Right (CPR) and Canine prominence Left (CPL) may be further included. The software may display the detected landmarks on the screen. At this time, it is possible to divide the type of landmark into identifiable time information and display it on the screen.

Software according to an embodiment may detect landmarks using machine learning-based artificial intelligence. Hereinafter, an example of landmark detection using artificial intelligence will be described.

First, the software may perform artificial intelligence-based learning to generate learning data or acquire the generated learning data. For example, by generating a training data set and applying machine learning to the generated training data set, as the accuracy increases, optimal training data can be provided when random data comes in. train The machine learning method is a field of artificial intelligence, and is used in voice and video, and is particularly used for image classification, contrast, and comparative analysis. If the target data is an image, the processing method is to secure an image library, categorize it, extract features with an artificial neural network such as a convolutional neural network (CNN), and train them to improve accuracy. .

Then, the impression model data of the patient entered as the current input may be analyzed based on the learning data to extract an area where a landmark is expected. As an example, the occlusion rim and model of the acquired impression model data are analyzed. Then, the impression model data for which the occlusion and model analysis were performed are compared with the learning data, and landmarks (e.g. Maxillary Tuberosity Right (MTR), Maxillary Tuberosity Left (MTL) of the upper jaw, Retromolar Pad Mesial Right (RPMR) of the lower jaw) are compared. , Retromolar Pad Mesial Left (RPML)) is expected to be extracted. Through occlusion and model analysis of impression model data, it is possible to search learning data with the most similar features and arrangement.

Subsequently, a point having the largest curvature within the extracted landmark expected region is set as a landmark. As an example, a point located at the foremost or rearmost position of a region expected to be a tooth position (a position where a tooth has or should be present), or a point with the most elevation or depression corresponds to a point having the greatest curvature.

Meanwhile, the software generates an arch line such that the arch shape generated through step S210 passes through a preset range based on the landmark detected through step S220 (S230). Furthermore, the software may correct the arch line by user manipulation (S240).

Next, the software arranges the denture on the impression model data along the created or modified arch line (S250). In the tooth arrangement step (S250), the teeth of the lower jaw may be arranged in proportion to the size of the teeth of the upper jaw, or the teeth of the upper jaw may be arranged in proportion to the size of the teeth of the lower jaw. In the present invention, virtual teeth, dentures, artificial teeth, and digital teeth are all used in the same meaning.

3 is a diagram illustrating a process of creating a maxillary arch line for denture arrangement according to an embodiment of the present invention.

Referring to FIG. 3 , the process of generating an upper arch line for denture arrangement may consist of ① impression body data acquisition step, ② landmark detection step for arch line generation, ③ arch line generation step, and ④ virtual tooth arrangement step.

The software acquires impression body data (negative type) and corresponding 3D impression model data (both type) in step ① impression body data acquisition. At this time, the arch shape of the upper jaw may be created by connecting the most protruding part of the 3D impression model data (both types).

Subsequently, the software detects landmarks for arch line generation of the upper jaw in ② the landmark detection step for arch line generation. The landmark for creating the maxillary arch line may include at least one of Central Ridge Point (CRP), Canine prominence Right (CPR), Canine prominence Left (CPL), Maxillary Tuberosity Right (MTR), and Maxillary Tuberosity Left (MTL). have. An example of creating a landmark for creating an arch line of the upper jaw will be described later with reference to FIGS. 6 and 7 .

Then, in the step ③ of creating an arch line, the software creates an ideal arch line by allowing the arch shape generated in step ① to pass through a preset range based on the landmark detected in step ②. In the example of FIG. 3, it can be seen that the ideal arch line passes through the Central Ridge Point (CRP), Canine prominence Right (CPR), Canine prominence Left (CPL), Maxillary Tuberosity Right (MTR), and Maxillary Tuberosity Left (MTL). have.

Then, the software arranges the denture along the arch line created by ④. ④In the tooth arrangement step, the software sets the posterior teeth of the maxilla so that the fossa of each posterior tooth is located within a predetermined range based on the alveolar line from the canine prominence (CPR, CPL) on both sides of the maxilla to the maxillary tuberosity (MTR, MTL) on both sides of the maxilla. can be arranged

The software can arrange the central incisor so that the labial surface of the maxillary central incisor is positioned at a preset distance forward from the Incisive Papilla (IP) in the ④ tooth arrangement step. The preset distance is modifiable by the user. To this end, the software may additionally perform a step of detecting the incisive papilla as a landmark for arranging teeth in the upper jaw in advance.

4 is a diagram illustrating a process of creating a lower arch line for denture arrangement according to an embodiment of the present invention.

Referring to FIG. 4 , the process of creating a mandibular arch line for denture arrangement may consist of ① impression body data acquisition step, ② landmark detection step for arch line generation, ③ arch line generation step, and ④ virtual tooth arrangement step.

The software acquires impression body data (negative type) and corresponding 3D impression model data (both type) in step ① impression body data acquisition. At this time, the arch shape of the lower jaw may be created by connecting the most protruding part of the 3D impression model data (both types).

Subsequently, the software detects landmarks for arch line generation of the lower jaw in ② the landmark detection step for arch line generation. The landmark for creating the arch line of the lower jaw may include at least one of a Central Ridge Point (CRP), a Retromolar Pad Mesial Right (RPMR), and a Retromolar Pad Mesial Left (RPML). Additionally, Canine prominence Right (CPR) and Canine prominence Left (CPL) may be further included. An example of creating a landmark for creating a lower arch line will be described later with reference to FIGS. 9 and 10 .

Then, in the step ③ of creating an arch line, the software creates an ideal arch line by allowing the arch shape generated in step ① to pass through a preset range based on the landmark detected in step ②. In the example of FIG. 4 , the ideal arch line passes through the Central Ridge Point (CRP), Canine prominence Right (CPR), Canine prominence Left (CPL), Retromolar Pad Mesial Right (RPMR), and Retromolar Pad Mesial Left (RPML). You can check.

Subsequently, the software arranges the dentures on the impression model data along the arch line ④ created. ④In the tooth arrangement step, in the case of the mandible, the software arranges the posterior posterior teeth so that the posterior posterior teeth do not exceed the bilateral Retromolar Pad Mesial (RPMR, RPML), and bilateral Retromolar Pad Mesial (RPMR) in the bilateral canine prominence (CPR, CPL). , RPML), the posterior teeth of the lower jaw can be arranged so that the Fossa of each posterior tooth is located within a predetermined range based on the alveolar line.

In the ④ tooth arrangement step, the software adjusts the posterior teeth of the lower jaw so that the lingual cusps of each posterior tooth of the lower jaw do not cross the Pound's Line connecting the bilateral Retromolar Pad Lingual (RPMR, RPML) and the bilateral Canine Prominence (CPR, CPL). can be arranged To this end, the software may additionally perform a step of detecting both retromolar pad linguals (RPMR, RPML) as landmarks for arranging teeth of the lower jaw in advance.

The software can arrange the rearmost posterior teeth so that the occlusal surface of the posterior posterior teeth in the lower jaw does not rise higher than the 2/3 point of the retromolar pad in the alveolar crest in the step of ④ tooth arrangement. To this end, the software may additionally perform a step of detecting 2/3 points of both Retromolar Pads as landmarks for arranging the teeth of the lower jaw in advance.

5 is a diagram illustrating an example of generating an arch shape from impression model data of the upper jaw according to an embodiment of the present invention.

Referring to FIG. 5 , after obtaining impression body data (negative shape) 51 of the upper jaw, the software acquires impression body data (negative shape) 51 and corresponding 3D impression model data (both shape) 52 . When viewed from the coronal plane, the arch shape of the upper jaw is created by connecting the most protruding part 520 of the 3D impression model data (both types) 52.

6 is a diagram illustrating an example of generating an arch line by detecting landmarks for creating an arch line of the upper jaw and connecting the detected landmarks for creating an arch line according to an embodiment of the present invention.

Referring to FIG. 6, the software calculates the 1-1 point for determining the position of the central incisor, the 2-1 point for determining the position of the canine tooth, and the rearmost molar (= second molar) in the impression model data 52 of the upper jaw. The 3-1 point for location determination may be detected as a landmark. The 1-1 point is the Central Ridge Point (CRP), the 2-1 point is both Canine prominence (CPR, CPL), and the 3-1 point may be both Maxillary Tuberosity (MTR, MTL). The alveolar line is used to create an arch line necessary for tooth arrangement, and the above-mentioned points can be used as landmarks for extracting the alveolar line.

The Central Ridge Point (CRP) is the most anterior central part of the alveolar line and can be used as a reference point when determining the position of the central incisor.

Bilateral canine prominence (CPR, CPL) can be used as a reference point when determining canine position. Since the canine is the tooth that lasts the longest on average among natural teeth, it is possible to find a phenomenon where the canine slightly protrudes from the alveolar crest, and when the patient has natural teeth, bilateral canine prominence (CPR, CPL) is used to determine the position of the canine. Can be used as a reference point.

Bilateral maxillary tuberosity (MTR, MTL) is a landmark for reference of the limiting point when arranging maxillary posterior teeth, and can also be seen as the starting point of the rearmost part of the arch line. Since the size of the maxillary posterior teeth can be determined by the mandibular Retromolar Pad Mesial (RPMR, RPML), the actual maxillary posterior teeth may be arranged beyond both Maxillary Tuberosities (MTR, MTL).

Subsequently, the software generates an arch line 600 such that the arch shape generated from the impression model data 52 passes through a range set in advance based on the aforementioned landmark. That is, the final arch line 600 of the upper jaw may be generated by correcting the arc-shaped line generated from the impression model data to pass within a preset range based on the aforementioned landmark.

7 is a diagram illustrating additionally detectable landmarks in the upper jaw according to an embodiment of the present invention.

Referring to FIG. 7 , the software may detect an Incisive Papilla 710 for maxillary tooth arrangement as a landmark. Incisive Papilla (710) is not a landmark for creating an arch line, but can be used as a landmark for positioning the labial surface of the central incisor.

The software may detect Hamular Notch (HNR, HNL) 720 as the 3-1st point for determining the position of the rear molar tooth (= second molar tooth). The Hamular Notch (HNR, HNL) (720) is the deepest point formed at the rear of the remaining teeth and can be used as a landmark because its anatomical position does not change. Maxillary tuberosity (MTR, MTL) can be used instead when landmarks are not detected.

8 is a diagram illustrating an example of generating an arch shape from impression model data of the lower jaw according to an embodiment of the present invention.

Referring to FIG. 8 , after obtaining impression body data (negative shape) 81 of the lower jaw, the software acquires impression body data (negative shape) 81 and corresponding 3D impression model data (both shape) 82 . When viewed from the coronal plane, the arch shape of the lower jaw is created by connecting the most protruding part 820 of the 3D impression model data (both types) 82.

9 is a diagram illustrating an example of detecting a landmark for creating an arch line of the lower jaw according to an embodiment of the present invention.

Referring to FIG. 9, the software uses the 1-2 points for determining the position of the central incisor and the 3-2 point for determining the position of the rearmost molar (= second molar) in the impression model data 82 of the lower jaw as landmarks. can be detected. The 1-2 point may be a Central Ridge Point (CRP), and the 3-2 point may be both Retromolar Pad Mesials (RPMR, RPML).

The Central Ridge Point (CRP) is the most anterior central part of the alveolar line and can be used as a reference point when determining the position of the central incisor.

Since the Retromolar Pad Mesial (RPMR, RPML) can be used as a limiting point when arranging the mandibular posterior teeth, it can also be seen as the starting point of the rearmost part of the arch line. If the posterior posterior teeth of the mandible are aligned beyond the Retromolar Pad Mesial (RPMR, RPML), it may cause denture loss.

The software may additionally detect the 2-2nd point for determining the canine position in the lower jaw. The 2-2 point may be bilateral canine prominence (CPR, CPL). Bilateral canine prominence (CPR, CPL) can be used as a reference point when determining canine position. Since the canine is the tooth that lasts the longest on average among natural teeth, it is possible to find a phenomenon where the canine slightly protrudes from the alveolar crest, and when the patient has natural teeth, bilateral canine prominence (CPR, CPL) is used to determine the position of the canine. Can be used as a reference point.

In the case of the mandible, the position of the canine prominence (CPR, CPL) on both sides does not absolutely determine the position of the canine in the mandible, but the position of the canine is usually a suitable point for connecting the anterior and posterior teeth, so it can be additionally detected as a landmark. The position of the canines in the lower jaw can be determined by the size of the teeth in the upper jaw.

Next, the software generates an arch line 900 such that the arch shape generated from the impression model data 82 of the lower jaw passes through a preset range based on the landmark described above. That is, the final arch line 900 of the lower jaw may be generated by modifying the arch-shaped line generated from the impression model data 82 to pass within a preset range based on the aforementioned landmark.

10 is a diagram illustrating additionally detectable landmarks in the lower jaw according to an embodiment of the present invention.

Referring to FIG. 10 , the software may detect bilateral Retromolar Pad Linguals (RPMR, RPML) 1010 for arranging teeth of the lower jaw as landmarks. Bilateral Retromolar Pad Lingual (RPMR, RPML) (1010) is not a reference point for creating an arch line, but can be used as an essential landmark when arranging teeth. When arranging the teeth, the Pound's Line connecting the retromolar pad lingual (RPMR, RPML) (1010) on both sides and the canine prominence (CPR, CPL) on both sides can be applied as the limit line for the lingual alignment of the lower posterior teeth. For example, the posterior teeth of the lower jaw are arranged so that the lingual cusps of each posterior tooth do not cross the Pound's Line connecting the bilateral Retromolar Pad Lingual (RPMR, RPML) (1010) and the bilateral canine prominence (CPR, CPL).

The software may detect the bilateral Retromolar Pad 2/3 points 1020 for the lower jaw tooth arrangement as landmarks. When arranging the teeth, the rearmost posterior teeth can be arranged so that the occlusal surface of the lowermost posterior teeth does not rise higher than the Retromolar Pad 2/3 point (1020) on both sides in the alveolar cortex.

11 is a diagram illustrating a flow for correcting an arch line according to an embodiment of the present invention.

Referring to FIG. 11 , after the upper and lower arch lines 600 and 900 are generated, the user may modify at least one of the upper and lower arch lines 600 and 900 . For example, after modifying the maxillary arch line 600 by an action of selecting and moving a point from the generated maxillary arch line 600, the user selects and moves the corrected maxillary arch line 600'. can be displayed on the screen. As another example, the user selects and moves a point from the generated lower arch line 900 to modify the lower jaw arch line 900, and then displays the corrected lower jaw arch line 900' on the screen. can be displayed on In this case, when any one of the upper and lower arch lines is corrected, the corresponding arch line of the opposite jaw can be automatically corrected, thereby increasing convenience of use.

Furthermore, the software guides the correction of the user's arch line by displaying the expected line 1110 on the buccal-lingual side of the lower jaw on the upper jaw or the expected line 1120 on the buccal-lingual side of the upper jaw on the lower jaw using the occlusion relationship between the upper jaw and the lower jaw. can do. The user may correct the arch line 600 of the upper jaw while checking the expected line 1110 on the buccal-lingual side of the lower jaw displayed in the upper jaw data, and the arch line of the lower jaw while checking the expected line 1120 on the bucco-lingual side of the upper jaw displayed on the lower jaw data. (900) can be modified.

12 is a diagram illustrating an example of a method for correcting an arch line according to an embodiment of the present invention.

Referring to FIG. 12, the user selects and moves a point 1210 that the user wants to correct in the maxillary arch line 600 (1210 -> 1210') to move the maxillary arch line to a desired location ( 600 -> 600').

Similarly, the user selects and moves a point 1220 on the arch line 900 of the lower jaw that the user wants to correct (1220->1220'), thereby moving the arch line of the lower jaw to a desired location (900->900'). )can do.

In this case, even if only one of the upper and lower arch lines is corrected, the corresponding arch line of the opposite jaw may be automatically corrected in consideration of the occlusion relationship.

So far, the present invention has been looked at mainly by its embodiments. Those skilled in the art to which the present invention pertains will be able to understand that the present invention may be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered from a descriptive point of view rather than a limiting point of view. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the equivalent scope will be construed as being included in the present invention.

Claims (19)

obtaining impression model data of the patient;
extracting a region where a landmark is predicted by analyzing the obtained impression model data based on learning data, wherein the learning data is generated by performing artificial intelligence-based learning;
detecting a point having the greatest curvature within the extracted landmark expected region as a landmark for generating an arch line; and
generating an arch line based on the detected landmark;
Digital denture design method comprising a. generating an arch shape using impression model data of the patient;
detecting a landmark for arch line generation from the impression model data;
generating an arch line by allowing the created arch shape to pass within a preset range based on the detected landmark; and
arranging the denture along the created arch line;
Digital denture design method comprising a. 3. The method of claim 2, wherein the step of creating the arch shape
obtaining impression body data of the patient;
obtaining corresponding impression model data from the acquired impression body data; and
generating an arch shape by connecting the most protruding parts of the obtained impression model data;
Digital denture design method comprising a. 3. The method of claim 2, wherein detecting the landmark
Detecting the 1-1 point for determining the position of the upper central incisor, the 2-1 point for determining the position of the maxillary canine, and the 3-1 point for determining the position of the maxillary posterior molar as landmarks Digital denture design methods. According to claim 4,
The 1-1 point is the Central Ridge Point (CRP),
The 2-1 point is bilateral canine prominence (CPR, CPL),
The 3-1 point is a digital denture design method, characterized in that at least one of both Maxillary Tuberosity (MTR, MTL) and both Hamular Notch (HNR, HNL). 3. The method of claim 2, wherein detecting the landmark
A digital denture design method characterized by detecting the 1-2 points for determining the position of the lower central incisor and the 3-2 point for determining the position of the posterior posterior teeth of the lower jaw as landmarks. According to claim 6,
The 1-2 points are the Central Ridge Point (CRP),
The 3-2 point is a digital denture design method, characterized in that the bilateral Retromolar Pad Mesial (RPMR, RPML). 7. The method of claim 6, wherein the step of detecting the landmark
Additional detection of the 2-2 point for determining the canine position of the lower jaw as a landmark,
The 2-2nd point is a digital denture design method, characterized in that bilateral canine prominence (CPR, CPL). 3. The method of claim 2, wherein arranging the denture comprises
Digital denture, characterized by arranging the posterior teeth of the maxilla so that the fossa of each posterior tooth is located within a predetermined range based on the alveolar line from the canine prominence (CPR, CPL) on both sides of the maxilla to the maxillary tuberosity (MTR, MTL) on both sides of the maxilla design method. The method of claim 2, wherein the digital denture design method
Detecting Incisive Papilla for maxillary tooth arrangement as a landmark; Including more,
The step of arranging the dentures is
A digital denture design method characterized by arranging the central incisor so that the labial surface of the maxillary central incisor is located at a preset distance forward from the Incisive Papilla. 3. The method of claim 2, wherein arranging the denture comprises
In the case of the lower jaw, arrange the posterior posterior teeth so that the posterior posterior teeth do not exceed both retromolar pad mesials (RPMR, RPML),
Digital denture design method characterized by arranging the posterior teeth of the lower jaw so that the Fossa of each posterior tooth is located within a predetermined range based on the alveolar line from both Canine prominence (CPR, CPL) to both Retromolar Pad Mesial (RPMR, RPML). The method of claim 2, wherein the digital denture design method
Detecting both retromolar pad linguals (RPMR, RPML) for mandibular tooth arrangement as landmarks; Including more,
The step of arranging the dentures is
Digital denture design method characterized by arranging the posterior teeth of the lower jaw so that the lingual cusps of each posterior teeth do not exceed the Pound's Line connecting both retromolar pad linguals (RPMR, RPML) and both canine prominences (CPR, CPL) . The method of claim 2, wherein the digital denture design method
Detecting 2/3 points of both retromolar pads for the lower jaw tooth arrangement as landmarks; Including more,
The step of arranging the dentures is
A digital denture design method characterized by arranging the posterior posterior teeth so that the occlusal surface of the mandibular posterior posterior teeth does not rise higher than the retromolar pad 2/3 point in the alveolar crown. 3. The method of claim 2, wherein arranging the denture comprises
A digital denture design method characterized by arranging the teeth of the lower jaw in proportion to the size of the teeth of the upper jaw or arranging the teeth of the upper jaw in proportion to the size of the teeth of the lower jaw. The method of claim 2, wherein the digital denture design method
modifying the created arch line by user manipulation;
Digital denture design method characterized in that it further comprises. 16. The method of claim 15, wherein the modifying step
A digital denture design method, characterized in that the arch line is modified and displayed by an operation of selecting and moving a point where the user wants to modify in the generated arch line. 16. The method of claim 15, wherein the digital denture design method
guiding a user to correct an arch line by displaying a bucco-lingual expected line of the lower jaw on the upper jaw or a bucco-lingual expected line of the upper jaw on the lower jaw using the occlusion relationship between the upper jaw and the lower jaw;
Digital denture design method characterized in that it further comprises. 16. The method of claim 15, wherein the digital denture design method
automatically correcting a corresponding arch line of the opposite jaw when correcting one of the upper and lower arch lines;
Digital denture design method characterized in that it further comprises. a data acquiring unit acquiring impression model data of the patient;
An arch shape is created using the impression model data acquired through the data acquisition unit, a landmark for arch line generation is detected from the impression model data, and the created arch shape is determined in advance based on the detected landmark. A control unit for arranging dentures along the created arch line after creating an arch line to pass through a set range; and
an output unit that outputs information including tooth arrangement;
Digital denture design device comprising a.

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